| 摘要 |
The oxyethylation synthesis is carried out in such a manner that a total quantity of the catalyst is fed to a relatively small (preferably as small as possible) portion of the predesigned quantity of the reactant, whereafter oxyethylation is commenced by introducing a portion of the predesigned quantity of ethylene oxide to achieve the phase of fast acceleration of the conversion of ethylene oxide, i.e., activation of the catalyst that is present in a relatively high concentration in contact with the reactant and with ethylene oxide in the reaction environment. The synthesis process is then continued by introducing the remaining portion of the reactant and the remaining portion of ethylene oxide either in one step or gradually. In the method of the invention, owing to the fact that the oxyethylation reaction is commenced in the presence of the entire predesigned quantity of the catalyst and a portion of the predesigned quantity of the reactant, the catalyst's concentration is many times as high in the reaction induction phase, thus enabling the reaction induction time to be minimized or eliminated and the rate of conversion of ethylene oxide in the first phase of synthesis to be increased. On the other hand, introduction of a substantial portion of the supplementary stream of the reactant and ethylene oxide as late as in the following phase of fast reaction will not affect the conversion of ethylene oxide or the efficiency of synthesis in time, even though the activated catalyst gets relatively diluted. |
